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Message-ID: <35a5cf2e-caa4-48bf-a5be-3cbae9865f6a@riseup.net>
Date: Sat, 26 Oct 2024 12:22:02 -0300
From: Maíra Canal <mairacanal@...eup.net>
To: Louis Chauvet <louis.chauvet@...tlin.com>,
Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
Haneen Mohammed <hamohammed.sa@...il.com>,
Melissa Wen <melissa.srw@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Simona Vetter <simona.vetter@...ll.ch>
Cc: thomas.petazzoni@...tlin.com, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/vkms: Remove index parameter from init_vkms_output
Hi Louis,
On 10/10/24 14:27, Louis Chauvet wrote:
> VKMS currently supports only one CRTC, so it make no sense to have this
> index configurable. To avoid issues, replace this hardcoded index by
> drm_crtc_mask when applicable.
>
> There is no need to manually set a crtc mask on primary and cursor plane
> as it is automatically set by drmm_crtc_alloc_with_planes.
>
> In addition, this will remove the use of an uninitialized structure in
> vkms_add_overlay_plane. This currently works by chance because two things:
> - vkms_plane_init always set a possible_crtcs value, so the problematic
> branch is never used;
> - drm_crtc_mask on an kzalloc'd drm_crtc returns BIT(0), and the VKMS CRTC
> always have this id.
>
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> ---
> Changes in v2:
> - Applied comments from José
> - Link to v1: https://lore.kernel.org/r/20240906-vkms-remove-index-v1-1-3cfedd8ccb2f@bootlin.com
> ---
> drivers/gpu/drm/vkms/vkms_drv.c | 2 +-
> drivers/gpu/drm/vkms/vkms_drv.h | 8 ++----
> drivers/gpu/drm/vkms/vkms_output.c | 54 ++++++++++++++------------------------
> drivers/gpu/drm/vkms/vkms_plane.c | 4 +--
> 4 files changed, 24 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
> index 2d1e95cb66e5..0f6805b9fe7b 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.c
> +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> @@ -174,7 +174,7 @@ static int vkms_modeset_init(struct vkms_device *vkmsdev)
> dev->mode_config.preferred_depth = 0;
> dev->mode_config.helper_private = &vkms_mode_config_helpers;
>
> - return vkms_output_init(vkmsdev, 0);
> + return vkms_output_init(vkmsdev);
> }
>
> static int vkms_create(struct vkms_config *config)
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index 672fe191e239..036101ee4ea1 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -212,21 +212,17 @@ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
> * vkms_output_init() - Initialize all sub-components needed for a VKMS device.
> *
> * @vkmsdev: VKMS device to initialize
> - * @index: CRTC which can be attached to the planes. The caller must ensure that
> - * @index is positive and less or equals to 31.
> */
> -int vkms_output_init(struct vkms_device *vkmsdev, int index);
> +int vkms_output_init(struct vkms_device *vkmsdev);
>
> /**
> * vkms_plane_init() - Initialize a plane
> *
> * @vkmsdev: VKMS device containing the plane
> * @type: type of plane to initialize
> - * @index: CRTC which can be attached to the plane. The caller must ensure that
> - * @index is positive and less or equals to 31.
> */
> struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
> - enum drm_plane_type type, int index);
> + enum drm_plane_type type);
>
> /* CRC Support */
> const char *const *vkms_get_crc_sources(struct drm_crtc *crtc,
> diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> index 0a5a185aa0b0..5128aa3b2eb6 100644
> --- a/drivers/gpu/drm/vkms/vkms_output.c
> +++ b/drivers/gpu/drm/vkms/vkms_output.c
> @@ -32,29 +32,14 @@ static const struct drm_connector_helper_funcs vkms_conn_helper_funcs = {
> .get_modes = vkms_conn_get_modes,
> };
>
> -static int vkms_add_overlay_plane(struct vkms_device *vkmsdev, int index,
> - struct drm_crtc *crtc)
> -{
> - struct vkms_plane *overlay;
> -
> - overlay = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_OVERLAY, index);
> - if (IS_ERR(overlay))
> - return PTR_ERR(overlay);
> -
> - if (!overlay->base.possible_crtcs)
> - overlay->base.possible_crtcs = drm_crtc_mask(crtc);
> -
> - return 0;
> -}
> -
> -int vkms_output_init(struct vkms_device *vkmsdev, int index)
> +int vkms_output_init(struct vkms_device *vkmsdev)
> {
> struct vkms_output *output = &vkmsdev->output;
> struct drm_device *dev = &vkmsdev->drm;
> struct drm_connector *connector = &output->connector;
> struct drm_encoder *encoder = &output->encoder;
> struct drm_crtc *crtc = &output->crtc;
> - struct vkms_plane *primary, *cursor = NULL;
> + struct vkms_plane *primary, *overlay, *cursor = NULL;
> int ret;
> int writeback;
> unsigned int n;
> @@ -65,34 +50,37 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
> * The overlay and cursor planes are not mandatory, but can be used to perform complex
> * composition.
> */
> - primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, index);
> + primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY);
> if (IS_ERR(primary))
> return PTR_ERR(primary);
>
> - if (vkmsdev->config->overlay) {
> - for (n = 0; n < NUM_OVERLAY_PLANES; n++) {
> - ret = vkms_add_overlay_plane(vkmsdev, index, crtc);
> - if (ret)
> - return ret;
> - }
> - }
> -
> if (vkmsdev->config->cursor) {
> - cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR, index);
> + cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR);
> if (IS_ERR(cursor))
> return PTR_ERR(cursor);
> }
>
> - /* [1]: Allocation of a CRTC, its index will be BIT(0) = 1 */
> ret = vkms_crtc_init(dev, crtc, &primary->base, &cursor->base);
> if (ret)
> return ret;
>
> + if (vkmsdev->config->overlay) {
> + for (n = 0; n < NUM_OVERLAY_PLANES; n++) {
> + overlay = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_OVERLAY);
> + if (IS_ERR(overlay)) {
> + DRM_DEV_ERROR(dev->dev, "Failed to init vkms plane\n");
> + ret = PTR_ERR(overlay);
> + goto err_crtc;
> + }
> + overlay->base.possible_crtcs = drm_crtc_mask(crtc);
> + }
> + }
> +
> ret = drm_connector_init(dev, connector, &vkms_connector_funcs,
> DRM_MODE_CONNECTOR_VIRTUAL);
> if (ret) {
> DRM_ERROR("Failed to init connector\n");
> - goto err_connector;
> + goto err_crtc;
> }
>
> drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
> @@ -103,11 +91,7 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
> DRM_ERROR("Failed to init encoder\n");
> goto err_encoder;
> }
> - /*
> - * This is a hardcoded value to select crtc for the encoder.
> - * BIT(0) here designate the first registered CRTC, the one allocated in [1]
> - */
> - encoder->possible_crtcs = BIT(0);
> + encoder->possible_crtcs = drm_crtc_mask(crtc);
>
> ret = drm_connector_attach_encoder(connector, encoder);
> if (ret) {
> @@ -131,7 +115,7 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
> err_encoder:
> drm_connector_cleanup(connector);
>
> -err_connector:
> +err_crtc:
> drm_crtc_cleanup(crtc);
Do we really need `drm_crtc_cleanup`? We are allocating the CRTC with
`drmm_crtc_init_with_planes`.
The rest looks fine to me.
Best Regards,
- Maíra
>
> return ret;
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index e5c625ab8e3e..ad137c9a75f5 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -198,12 +198,12 @@ static const struct drm_plane_helper_funcs vkms_plane_helper_funcs = {
> };
>
> struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
> - enum drm_plane_type type, int index)
> + enum drm_plane_type type)
> {
> struct drm_device *dev = &vkmsdev->drm;
> struct vkms_plane *plane;
>
> - plane = drmm_universal_plane_alloc(dev, struct vkms_plane, base, 1 << index,
> + plane = drmm_universal_plane_alloc(dev, struct vkms_plane, base, 0,
> &vkms_plane_funcs,
> vkms_formats, ARRAY_SIZE(vkms_formats),
> NULL, type, NULL);
>
> ---
> base-commit: 33c255312660653cf54f8019896b5dca28e3c580
> change-id: 20240906-vkms-remove-index-3a6e04c38e02
>
> Best regards,
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